@kyoukhana

If it was generated by Let’s Encrypt, your key files will be within the /etc/letsencrypt directory. If you didn’t use Let’s Encrypt, they’d be in the location you placed them in when you setup your cert.

You should be able to look at your VirtualHost or Server Block configuration to find the exact path of the cert and the private key though.

Your configuration would be in either:

/etc/apache2/sites-available

or

/etc/nginx/sites-available